Window and door alarm.



J. SWAN. I WINDOW AND DOOR ALARM.

APPLICATION FILED DBO. 12,1906.

WITNESSES 1.5 i icy INVENTOI? Afro/M 5) THE NORRIS PETERS C0,, WASHINGTON 0. cv

PATENTED MAR. 19, 1907.

JAMES SWAN, OF SEYMOUR, CONNECTICUT.

WINDOW AND DOOR ALARM.

Specification of Letters Patent.

Patented March 19, 1907.

Application filed December 12, 1906. Serial No. 347,479

To all whom it may cancer/1 Be it known that I, JAMEs SWAN, a citizen of the United States, residing at Seymour, county of New Haven, State of Connecticut, have invented a new and useful Window and Door Alarm, of whichthe following is a specification.

This invention has for its object to provide a simple and inexpensive portable bellalarm so small and compact'that'it may be conveniently carried in a traveling-bag and that may be conveniently applied to any window or door, as in a sleeping-apartment, without mechanical skill or the use of tools to give an alarm should the window be raised or the door opened.

With this and other objects in view I have devised the simple and novel portable alarm which I will now describe, referring to the accompanying drawing, forming a part of I this specification, and using reference charactors to indicate the several parts.

Figure 1 is an elevation of one form of my novel invention shown as applied to a door; Fig. 2, a plan view corresponding therewith, the cord and clamp being omitted; and Fig. 3 is an elevation of a slightly-variant form of the invention.

My novel alarm comprises, essentially, a bell of any ordinary type provided with an actuating member, an operating lever, a cord or its equivalent for connecting the operating-lever to a window or door, and a clamp for attachment to a knob-shank. 10 denotes the bell, which may be an ordinary bicycle or call bell of any of the types in ordinary use and which is provided with an actuating member, in the present instance a push-pin, (indicated by 11.) As it is simply required for the purposes of the present invention that the bell be provided with an actuating member, I have omitted all illustration of the mechanism of the'bell. In practice I have used and have found admirably adapted for the purpose required a bell in which the ringing operation is performed by a spring normally locked against action and released to ring the bell by movement of the actuating member. Any other style of bell, however, may be used, if preferred. 12 denotes a plate or bar which is riveted or otherwise rigidly secured to the bell. 13 denotes an operating-lever which is pivoted to the plate, as at 14.

In the form illustrated in Figs. 1 and 2, the long arm of the operating lever extends 'tached to a sash-fastener thereon.

along the'top of the bell and is shown as provided. at its end with'an eye 15 for the attachment of a cord 16. The short arm of'the operating-lever is curved downward into position to engage'the push-pin or other actuating member of the bell. It is of course wholly immaterial how the cord is attached to a window. It may, for'example, beat- In Fig. 3 I haveshownthe cord as provided with a screw-eye 17, which maybe turned into a window-sash as a means of connecting the alarm thereto. In addition to the bell and cord I also provide a clamp 18, adapted to engage the shank of a door-knob, (indicated by 19.) The special construction of the clamp is of course immaterial, so far as the principle of the invention is concerned. In the present mstance I have shown one member as loosely riveted to the other, as at 20,

and the two members as curved to adapt them to clasp the knob-shank and as drawn together to clamp the knob-shank or loosened to release it by means of a thumbscrew 21. One of the clam members is provided with a shank 22, s own with recesses 23 to receive the cord which is wound about the shank 22, lying in the recesses and knotted thereto.

The form illustrated in Fig. 3 differs in that the operating-lever is pivoted at the edge of the bell and is shown as curved to correspond with. the curvature of the edge of the bell. The short arm of the operatinglever engages the actuating member of the bell the same as in the other form.

The operation will be readily understood from the drawing, the normal or ino erative position of the operating-lever eing shown in full lines in Figs. 1 and 3, the operative position being indicated by dotted lines. When the alarm is used u on a window, the window may be close or partly raised, as preferred. The bell is laid upon the floor or elsewhere as most convenient, under or near the window, the cord connecting the operating-lever with the window being made just taut. When the window is raised, the operating-lever is oscillated on its fulcrum, the long arm of the lever being raised and the short arm pressed against the actuating member of the bell, causing it to ring. If a spring-bell is used, the bell will of course continue to ring until the springruns down or until the window is moved downward sufficiently to relieve the tension IIO on the cord. The instant the tension upon the cord is relieved the actuating member of the bell Will return to its normal position and will return the operating-lever likewise to its normal position, as in full lines in the drawing. When the alarm is used upon a door, the clamp is placed upon the knob-shank in a pendent position and locked there by tighting up the thumb-screw, the bell being placed upon the floor or elsewhere as most convenient, under or near the knob, and the cord drawn taut and attached to the shank of the clamp. When the knob-shank is oscillated in either direction, the weight of the bell will hold it down and the operating-lever will be oscillated, as before, on its fulcrum, the long arm being raised and the short arm ressed against the actuating member of the ell, causing it to ring.

invention, I

about a knob-shank, one of the clamp members having a shank for the attachment of the cord.

In testimony whereof I afhx my signature in presence of two witnesses.

JAMES SWAN. Witnesses A. M. Woosrnn, S. W. ATIIERTON. 

